a woman on the mexico u.s. border. it happened this morning near the town of nacko, arizona. one, as we said, died and the third agent was with them and not hurt. the agents went to investigate an alarm. so far, no suspect information has been released. officials say that area is frequented by drug smugglers. >>> now to decision 2012. president obama and republican presidential candidate mitt romney are taking the day off to prepare for tomorrow's big showdown. the first of three debates will take place in denver. both the president and romney are running through full rehearsals to fine tune their talking points. as of this morning, president obama has the lead in all nine of the key battle ground states. both campaigns say to him night is important to reach undecided voters. >> it will be a conversation. we will get to describe our views. >> the choice of two paths for this country. it's a choice between two fundamentally different visions for our nation. >> you can watch the debate in its entirety on nbc bay area. the topic is domestic policy. coverage starts wednesday night at 6:00.